[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.717913] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.688284] random: sshd: uninitialized urandom read (32 bytes read)
[   26.101958] random: sshd: uninitialized urandom read (32 bytes read)
[   26.601349] random: sshd: uninitialized urandom read (32 bytes read)
[   26.742826] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts.
[   32.229701] random: sshd: uninitialized urandom read (32 bytes read)
executing program
executing program
executing program
[   32.455059] ------------[ cut here ]------------
[   32.459968] WARNING: CPU: 1 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x598/0x760
[   32.468481] Kernel panic - not syncing: panic_on_warn set ...
[   32.468481] 
[   32.475850] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.118-g47b77b8 #20
[   32.482836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.492168]  ffff8801db307cc0 ffffffff81eb4b89 ffffffff83c48980 00000000ffffffff
[   32.500165]  0000000000000000 0000000000000001 00000000000000a7 ffff8801db307d80
[   32.508168]  ffffffff81421c25 0000000041b58ab3 ffffffff843bbfe8 ffffffff81421a66
[   32.516163] Call Trace:
[   32.518720]  <IRQ> [   32.520763]  [<ffffffff81eb4b89>] dump_stack+0xc1/0x128
[   32.526123]  [<ffffffff81421c25>] panic+0x1bf/0x3bc
[   32.531114]  [<ffffffff81421a66>] ? add_taint.cold.6+0x16/0x16
[   32.537061]  [<ffffffff81421ef6>] ? __warn.cold.9+0xa6/0x17f
[   32.542836]  [<ffffffff83427538>] ? inet_sock_destruct+0x598/0x760
[   32.549127]  [<ffffffff81421f11>] __warn.cold.9+0xc1/0x17f
[   32.554826]  [<ffffffff836c005f>] ? l2tp_tunnel_closeall+0x2af/0x350
[   32.561301]  [<ffffffff8113683c>] warn_slowpath_null+0x2c/0x40
[   32.567360]  [<ffffffff83427538>] inet_sock_destruct+0x598/0x760
[   32.573493]  [<ffffffff83426fa0>] ? ipv4_mib_init_net+0x570/0x570
[   32.579696]  [<ffffffff836c08a9>] l2tp_tunnel_destruct+0x339/0x590
[   32.585988]  [<ffffffff836c071a>] ? l2tp_tunnel_destruct+0x1aa/0x590
[   32.592455]  [<ffffffff836c0570>] ? l2tp_tunnel_del_work+0x470/0x470
[   32.598926]  [<ffffffff830230f5>] __sk_destruct+0x55/0x590
[   32.604527]  [<ffffffff812877ae>] rcu_process_callbacks+0x8ae/0x12b0
[   32.610992]  [<ffffffff8128788e>] ? rcu_process_callbacks+0x98e/0x12b0
[   32.617632]  [<ffffffff830230a0>] ? sock_set_timeout+0x210/0x210
[   32.623751]  [<ffffffff83a0367b>] __do_softirq+0x20b/0x937
[   32.629348]  [<ffffffff8114b277>] irq_exit+0x147/0x190
[   32.634600]  [<ffffffff83a02261>] smp_apic_timer_interrupt+0x81/0xa0
[   32.641065]  [<ffffffff839fe3f0>] apic_timer_interrupt+0xa0/0xb0
[   32.647186]  <EOI> [   32.649259]  [<ffffffff839fb6b6>] ? native_safe_halt+0x6/0x10
[   32.655142]  [<ffffffff81235c2d>] ? trace_hardirqs_on+0xd/0x10
[   32.661230]  [<ffffffff839facf5>] default_idle+0x55/0x360
[   32.666750]  [<ffffffff8106ae20>] arch_cpu_idle+0x10/0x20
[   32.672920]  [<ffffffff839fbb15>] default_idle_call+0x45/0x60
[   32.682173]  [<ffffffff812231b5>] cpu_startup_entry+0x2b5/0x380
[   32.688629]  [<ffffffff81222f00>] ? cpu_in_idle+0x20/0x20
[   32.694217]  [<ffffffff810aefa8>] start_secondary+0x328/0x400
[   32.700088]  [<ffffffff810aec80>] ? set_cpu_sibling_map+0x1300/0x1300
[   32.707073] Dumping ftrace buffer:
[   32.710617]    (ftrace buffer empty)
[   32.714309] Kernel Offset: disabled
[   32.717920] Rebooting in 86400 seconds..